docs: def recall(Ntp, Nref, eps=numpy.spacing(1)):
      """Recall.
  
      Wikipedia entry https://en.wikipedia.org/wiki/Precision_and_recall
  
      Parameters
      ----------
      Ntp : int >=0
          Number of true positives.
  
      Nref : int >=0
          Amount of reference.
  
      eps : float
          eps.
          Default value numpy.spacing(1)
  
      Returns
      -------
      recall: float
          Recall
  
      """
  
      if Nref == 0:
          return numpy.nan
      else:
          return float(Ntp / float(Nref))